Mercurial > cpython-lru_cache-weakref

annotate Python/random.c @ 87680:02d186e3af09 2.7

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Fixed JSON tests on wide build when ran from *.pyc files (issue #11489).
author Serhiy Storchaka <storchaka@gmail.com>
date Sun, 01 Dec 2013 17:30:55 +0200
parents 3e5078c3784e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
75100
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1 #include "Python.h"
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2 #ifdef MS_WINDOWS
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3 #include <windows.h>
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4 #else
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5 #include <fcntl.h>
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6 #endif
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7
75133
357e268e7c5f ensure no one tries to hash things before the random seed is found
Benjamin Peterson <benjamin@python.org>
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8 #ifdef Py_DEBUG
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9 int _Py_HashSecret_Initialized = 0;
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10 #else
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11 static int _Py_HashSecret_Initialized = 0;
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12 #endif
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13
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14 #ifdef MS_WINDOWS
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15 typedef BOOL (WINAPI *CRYPTACQUIRECONTEXTA)(HCRYPTPROV *phProv,\
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16 LPCSTR pszContainer, LPCSTR pszProvider, DWORD dwProvType,\
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17 DWORD dwFlags );
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18 typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV hProv, DWORD dwLen,\
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19 BYTE *pbBuffer );
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20
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21 static CRYPTGENRANDOM pCryptGenRandom = NULL;
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22 /* This handle is never explicitly released. Instead, the operating
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23 system will release it when the process terminates. */
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24 static HCRYPTPROV hCryptProv = 0;
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25
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26 static int
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27 win32_urandom_init(int raise)
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28 {
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29 HINSTANCE hAdvAPI32 = NULL;
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30 CRYPTACQUIRECONTEXTA pCryptAcquireContext = NULL;
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31
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32 /* Obtain handle to the DLL containing CryptoAPI. This should not fail. */
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33 hAdvAPI32 = GetModuleHandle("advapi32.dll");
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34 if(hAdvAPI32 == NULL)
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35 goto error;
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36
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37 /* Obtain pointers to the CryptoAPI functions. This will fail on some early
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38 versions of Win95. */
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39 pCryptAcquireContext = (CRYPTACQUIRECONTEXTA)GetProcAddress(
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40 hAdvAPI32, "CryptAcquireContextA");
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41 if (pCryptAcquireContext == NULL)
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42 goto error;
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43
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44 pCryptGenRandom = (CRYPTGENRANDOM)GetProcAddress(hAdvAPI32,
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45 "CryptGenRandom");
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46 if (pCryptGenRandom == NULL)
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47 goto error;
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48
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49 /* Acquire context */
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50 if (! pCryptAcquireContext(&hCryptProv, NULL, NULL,
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51 PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
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52 goto error;
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53
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54 return 0;
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55
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56 error:
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57 if (raise)
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58 PyErr_SetFromWindowsErr(0);
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59 else
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60 Py_FatalError("Failed to initialize Windows random API (CryptoGen)");
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61 return -1;
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62 }
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63
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64 /* Fill buffer with size pseudo-random bytes generated by the Windows CryptoGen
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65 API. Return 0 on success, or -1 on error. */
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66 static int
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67 win32_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
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68 {
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69 Py_ssize_t chunk;
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70
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71 if (hCryptProv == 0)
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72 {
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73 if (win32_urandom_init(raise) == -1)
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74 return -1;
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75 }
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76
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77 while (size > 0)
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78 {
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79 chunk = size > INT_MAX ? INT_MAX : size;
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80 if (!pCryptGenRandom(hCryptProv, chunk, buffer))
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81 {
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82 /* CryptGenRandom() failed */
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83 if (raise)
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84 PyErr_SetFromWindowsErr(0);
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85 else
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86 Py_FatalError("Failed to initialized the randomized hash "
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87 "secret using CryptoGen)");
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88 return -1;
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89 }
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90 buffer += chunk;
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91 size -= chunk;
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92 }
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93 return 0;
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94 }
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95 #endif /* MS_WINDOWS */
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96
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97
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98 #ifdef __VMS
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99 /* Use openssl random routine */
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100 #include <openssl/rand.h>
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101 static int
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102 vms_urandom(unsigned char *buffer, Py_ssize_t size, int raise)
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103 {
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104 if (RAND_pseudo_bytes(buffer, size) < 0) {
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diff changeset
105 if (raise) {
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106 PyErr_Format(PyExc_ValueError,
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107 "RAND_pseudo_bytes");
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108 } else {
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109 Py_FatalError("Failed to initialize the randomized hash "
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110 "secret using RAND_pseudo_bytes");
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111 }
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112 return -1;
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113 }
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114 return 0;
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parents:
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115 }
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116 #endif /* __VMS */
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117
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118
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119 #if !defined(MS_WINDOWS) && !defined(__VMS)
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120
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121 /* Read size bytes from /dev/urandom into buffer.
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122 Call Py_FatalError() on error. */
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123 static void
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124 dev_urandom_noraise(char *buffer, Py_ssize_t size)
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125 {
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Barry Warsaw <barry@python.org>
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126 int fd;
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127 Py_ssize_t n;
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128
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129 assert (0 < size);
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130
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131 fd = open("/dev/urandom", O_RDONLY);
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132 if (fd < 0)
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133 Py_FatalError("Failed to open /dev/urandom");
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134
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135 while (0 < size)
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136 {
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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137 do {
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138 n = read(fd, buffer, (size_t)size);
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139 } while (n < 0 && errno == EINTR);
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140 if (n <= 0)
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141 {
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142 /* stop on error or if read(size) returned 0 */
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143 Py_FatalError("Failed to read bytes from /dev/urandom");
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144 break;
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Barry Warsaw <barry@python.org>
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145 }
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Barry Warsaw <barry@python.org>
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146 buffer += n;
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147 size -= (Py_ssize_t)n;
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148 }
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Barry Warsaw <barry@python.org>
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149 close(fd);
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150 }
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Barry Warsaw <barry@python.org>
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151
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152 /* Read size bytes from /dev/urandom into buffer.
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153 Return 0 on success, raise an exception and return -1 on error. */
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154 static int
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155 dev_urandom_python(char *buffer, Py_ssize_t size)
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156 {
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Barry Warsaw <barry@python.org>
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157 int fd;
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158 Py_ssize_t n;
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159
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160 if (size <= 0)
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161 return 0;
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162
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163 Py_BEGIN_ALLOW_THREADS
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164 fd = open("/dev/urandom", O_RDONLY);
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165 Py_END_ALLOW_THREADS
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166 if (fd < 0)
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167 {
85200
ec296a36156b Issue #18756: Improve error reporting in os.urandom() when the failure is due to something else than /dev/urandom not existing.
Antoine Pitrou <solipsis@pitrou.net>
parents: 78875
diff changeset
168 if (errno == ENOENT || errno == ENXIO ||
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Antoine Pitrou <solipsis@pitrou.net>
parents: 78875
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169 errno == ENODEV || errno == EACCES)
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Antoine Pitrou <solipsis@pitrou.net>
parents: 78875
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170 PyErr_SetString(PyExc_NotImplementedError,
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Antoine Pitrou <solipsis@pitrou.net>
parents: 78875
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171 "/dev/urandom (or equivalent) not found");
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Antoine Pitrou <solipsis@pitrou.net>
parents: 78875
diff changeset
172 else
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Antoine Pitrou <solipsis@pitrou.net>
parents: 78875
diff changeset
173 PyErr_SetFromErrno(PyExc_OSError);
75100
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174 return -1;
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Barry Warsaw <barry@python.org>
parents:
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175 }
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parents:
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176
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177 Py_BEGIN_ALLOW_THREADS
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178 do {
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Barry Warsaw <barry@python.org>
parents:
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179 do {
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180 n = read(fd, buffer, (size_t)size);
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Barry Warsaw <barry@python.org>
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diff changeset
181 } while (n < 0 && errno == EINTR);
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Barry Warsaw <barry@python.org>
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diff changeset
182 if (n <= 0)
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Barry Warsaw <barry@python.org>
parents:
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183 break;
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Barry Warsaw <barry@python.org>
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184 buffer += n;
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185 size -= (Py_ssize_t)n;
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Barry Warsaw <barry@python.org>
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186 } while (0 < size);
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Barry Warsaw <barry@python.org>
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diff changeset
187 Py_END_ALLOW_THREADS
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188
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diff changeset
189 if (n <= 0)
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Barry Warsaw <barry@python.org>
parents:
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190 {
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
Barry Warsaw <barry@python.org>
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diff changeset
191 /* stop on error or if read(size) returned 0 */
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Barry Warsaw <barry@python.org>
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diff changeset
192 if (n < 0)
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Barry Warsaw <barry@python.org>
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diff changeset
193 PyErr_SetFromErrno(PyExc_OSError);
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Barry Warsaw <barry@python.org>
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194 else
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Barry Warsaw <barry@python.org>
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diff changeset
195 PyErr_Format(PyExc_RuntimeError,
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Barry Warsaw <barry@python.org>
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196 "Failed to read %zi bytes from /dev/urandom",
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Barry Warsaw <barry@python.org>
parents:
diff changeset
197 size);
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Barry Warsaw <barry@python.org>
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diff changeset
198 close(fd);
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diff changeset
199 return -1;
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parents:
diff changeset
200 }
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Barry Warsaw <barry@python.org>
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diff changeset
201 close(fd);
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Barry Warsaw <barry@python.org>
parents:
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202 return 0;
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Barry Warsaw <barry@python.org>
parents:
diff changeset
203 }
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Barry Warsaw <barry@python.org>
parents:
diff changeset
204 #endif /* !defined(MS_WINDOWS) && !defined(__VMS) */
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parents:
diff changeset
205
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Barry Warsaw <barry@python.org>
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diff changeset
206 /* Fill buffer with pseudo-random bytes generated by a linear congruent
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Barry Warsaw <barry@python.org>
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diff changeset
207 generator (LCG):
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Barry Warsaw <barry@python.org>
parents:
diff changeset
208
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Barry Warsaw <barry@python.org>
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diff changeset
209 x(n+1) = (x(n) * 214013 + 2531011) % 2^32
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parents:
diff changeset
210
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Barry Warsaw <barry@python.org>
parents:
diff changeset
211 Use bits 23..16 of x(n) to generate a byte. */
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Barry Warsaw <barry@python.org>
parents:
diff changeset
212 static void
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Barry Warsaw <barry@python.org>
parents:
diff changeset
213 lcg_urandom(unsigned int x0, unsigned char *buffer, size_t size)
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Barry Warsaw <barry@python.org>
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diff changeset
214 {
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
Barry Warsaw <barry@python.org>
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diff changeset
215 size_t index;
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Barry Warsaw <barry@python.org>
parents:
diff changeset
216 unsigned int x;
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parents:
diff changeset
217
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Barry Warsaw <barry@python.org>
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diff changeset
218 x = x0;
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Barry Warsaw <barry@python.org>
parents:
diff changeset
219 for (index=0; index < size; index++) {
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Barry Warsaw <barry@python.org>
parents:
diff changeset
220 x *= 214013;
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Barry Warsaw <barry@python.org>
parents:
diff changeset
221 x += 2531011;
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Barry Warsaw <barry@python.org>
parents:
diff changeset
222 /* modulo 2 ^ (8 * sizeof(int)) */
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Barry Warsaw <barry@python.org>
parents:
diff changeset
223 buffer[index] = (x >> 16) & 0xff;
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Barry Warsaw <barry@python.org>
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224 }
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
Barry Warsaw <barry@python.org>
parents:
diff changeset
225 }
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226
86106
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227 /* Fill buffer with size pseudo-random bytes from the operating system random
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228 number generator (RNG). It is suitable for for most cryptographic purposes
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229 except long living private keys for asymmetric encryption.
75100
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230
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231 Return 0 on success, raise an exception and return -1 on error. */
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232 int
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233 _PyOS_URandom(void *buffer, Py_ssize_t size)
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234 {
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235 if (size < 0) {
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236 PyErr_Format(PyExc_ValueError,
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237 "negative argument not allowed");
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238 return -1;
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239 }
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240 if (size == 0)
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241 return 0;
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242
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243 #ifdef MS_WINDOWS
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244 return win32_urandom((unsigned char *)buffer, size, 1);
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245 #else
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246 # ifdef __VMS
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247 return vms_urandom((unsigned char *)buffer, size, 1);
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248 # else
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249 return dev_urandom_python((char*)buffer, size);
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250 # endif
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251 #endif
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252 }
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253
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254 void
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255 _PyRandom_Init(void)
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256 {
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257 char *env;
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258 void *secret = &_Py_HashSecret;
75133
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259 Py_ssize_t secret_size = sizeof(_Py_HashSecret_t);
75100
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260
75133
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261 if (_Py_HashSecret_Initialized)
75100
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262 return;
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263 _Py_HashSecret_Initialized = 1;
75100
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264
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265 /*
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266 By default, hash randomization is disabled, and only
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267 enabled if PYTHONHASHSEED is set to non-empty or if
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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268 "-R" is provided at the command line:
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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269 */
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270 if (!Py_HashRandomizationFlag) {
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271 /* Disable the randomized hash: */
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272 memset(secret, 0, secret_size);
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273 return;
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274 }
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275
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276 /*
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277 Hash randomization is enabled. Generate a per-process secret,
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278 using PYTHONHASHSEED if provided.
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279 */
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280
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281 env = Py_GETENV("PYTHONHASHSEED");
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282 if (env && *env != '\0' && strcmp(env, "random") != 0) {
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283 char *endptr = env;
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284 unsigned long seed;
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285 seed = strtoul(env, &endptr, 10);
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286 if (*endptr != '\0'
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287 || seed > 4294967295UL
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288 || (errno == ERANGE && seed == ULONG_MAX))
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289 {
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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290 Py_FatalError("PYTHONHASHSEED must be \"random\" or an integer "
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291 "in range [0; 4294967295]");
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292 }
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293 if (seed == 0) {
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294 /* disable the randomized hash */
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295 memset(secret, 0, secret_size);
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296 }
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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diff changeset
297 else {
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diff changeset
298 lcg_urandom(seed, (unsigned char*)secret, secret_size);
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299 }
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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300 }
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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diff changeset
301 else {
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302 #ifdef MS_WINDOWS
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303 (void)win32_urandom((unsigned char *)secret, secret_size, 0);
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diff changeset
304 #else /* #ifdef MS_WINDOWS */
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diff changeset
305 # ifdef __VMS
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diff changeset
306 vms_urandom((unsigned char *)secret, secret_size, 0);
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diff changeset
307 # else
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diff changeset
308 dev_urandom_noraise((char*)secret, secret_size);
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diff changeset
309 # endif
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diff changeset
310 #endif
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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diff changeset
311 }
6b7704fe1be1 - Issue #13703: oCERT-2011-003: add -R command-line option and PYTHONHASHSEED
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diff changeset
312 }